there is a lot of literature on this topic, and showing that the culture and the environment does play a big role in the why so few girls aspire to the careers and women pursue them. in particular, stereotypes and still exist the stereotypes that girls are not as good at math as boys and these have the harmful effects of girls. even if you don't believe it, you know it exists and other people probably believe it. so it can actually affect the way that girls assess their own abilities and interesting res research by dr. shelly correl from stanford university that among the girls and boys with the same mathematical achievement in test scores and grades, the girls assess themselves lower. so that can help us to understand why they are seeming not to be as interested while part of being interested in something is thinking that you can succeed in it. >> and good at it initially. and once we had a conversation once that african-american girls don't camp. i was talking about being a girl scout and saying, no, no, of course we camp, but the very idea that there is some notion that what we can